39 research outputs found

    The Physics of the B Factories

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    CMD-3 Overview

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    The CMD-3 detector is installed at the VEPP-2000 e+eāˆ’ collider at BINP (Novosibirsk, Russia). It is a general-purpose detector, equipped with a tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe calorimeter, TOF and muon systems. The main goal of experiments at CMD-3 is a study of exclusive modes of e+eāˆ’ā†’ hadrons at energies sā‰¤ \sqrt s \le GeV. In particular, these results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking was performed in 2011ā€“2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. Here we present a survey of results of data analysis. Between 2013 and 2016 the collider and the detector were upgraded. The data taking resumed by the end of 2016. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. We discuss the upgrade and the first preliminary results from the new data

    Study of the process e+eāˆ’ā†’KS0KL0 in the center-of-mass energy range 1004ā€“1060 MeV with the CMD-3 detector at the VEPP-2000 e+eāˆ’ collider

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    The e+eāˆ’ā†’KS0KL0 cross section has been measured in the center-of-mass energy range 1004ā€“1060 MeV at 25 energy points using 6.1Ɨ105 events with KS0ā†’Ļ€+Ļ€āˆ’ decay. The analysis is based on 5.9Ā pbāˆ’1 of an integrated luminosity collected with the CMD-3 detector at the VEPP-2000 e+eāˆ’ collider. To obtain Ļ•(1020) meson parameters the measured cross section is approximated according to the Vector Meson Dominance model as a sum of the Ļ,Ļ‰,Ļ•-like amplitudes and their excitations. This is the most precise measurement of the e+eāˆ’ā†’KS0KL0 cross section with a 1.8% systematic uncertainty
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